<div dir="ltr"><div dir="ltr"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Yes, I meant the stack BMS on top. </div><br clear="all"></div><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">It's pretty crazy that I can connect a cable to it and see all of the individual battery units below, and the stack appears to be operating normally, but the stack BMS will not operate in parallel and does not display anything but zeroes on the display. I would think it could be recovered remotely or with software on my laptop, but apparently not. Why they are pushing back on the warranty is a mystery to me.</div><br></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">Principal Solar Designer | Florida Solar Design Group</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">NABCEP Certified Solar Professional (PVIP)</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Sep 23, 2025 at 5:51 PM Maverick Brown via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>By BMS, you mean the Main BMS, the top of the stack. I thought you meant BMS that is inside of each battery. Oh Boy! That’s a pain and is a whole other level! <div><br></div><div><br id="m_3005778064007751968lineBreakAtBeginningOfMessage"><div>
<div dir="auto" style="overflow-wrap: break-word;"><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Maverick Brown<br>Off-Grid Solar Commander since 2006<br><b>Maverick Solar Enterprises, Inc.</b></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><b> • Solar Commander Remote Power</b></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><b> • SunFlow Systems Cathodic Protection <br></b><a href="mailto:maverick@mavericksolar.com" target="_blank">maverick@mavericksolar.com</a><br>512-460-9825<br></div></div>
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<div><br><blockquote type="cite"><div>On Sep 23, 2025, at 1:38 PM, Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>> wrote:</div><br><div><div dir="ltr"><div><div style="font-family:arial,helvetica,sans-serif">You can purchase the BMS and base unit combination for each stack, but it costs nearly $1,500. I'm not sure if you can purchase the BMS separately from the base unit, but that probably wouldn't significantly impact the price. At this point, it's the principle of the matter. Not warranting something like this is bad business. It can't cost much to fix, and it would be important to understand what happened for future reference and quality assurance purposes. I guess they don't care to understand what happened.</div><br clear="all"></div><div><div style="font-family:arial,helvetica,sans-serif">I'm going to run this up the chain before I give up and tell the customer they're out of luck.</div><br></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">Principal Solar Designer | Florida Solar Design Group</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">NABCEP Certified Solar Professional (PVIP)</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 23, 2025 at 11:21 AM Maverick Brown via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Will they sell just the BMS instead of having to buy a whole other battery?<div><br></div><div>I know it should be covered under warranty, but buying a BMS is better than buying a battery.</div><div><br></div><div>I do have a home grid battery that’s behaved in the same way. I went around in circles with tech-support. I even bought $200 worth of cables so I can figure out what happened. But I never figured out what happened. And I don’t think it’s necessary for a tech-support to take control of my computer in order to do something that written instructions should be adequate.<br><div><br></div><div><br id="m_3005778064007751968m_-781453869809772219lineBreakAtBeginningOfSignature"><div dir="ltr">Thank you,<div><br></div><div>Maverick</div><div><div id="m_3005778064007751968m_-781453869809772219AppleMailSignature" style="font-family:Helvetica;font-size:12px"><div><br></div><div>Maverick Brown<br>Off-Grid Solar Commander since 2006<br>Maverick Solar Enterprises, Inc.<br> • Solar Commander Remote Power<br> • SunFlow Systems Cathodic Protection <br><a href="mailto:maverick@mavericksolar.com" target="_blank">maverick@mavericksolar.com</a><br>512-460-9825</div><div><br></div></div></div><div><br></div></div><div dir="ltr"><br><blockquote type="cite">On Sep 23, 2025, at 9:48 AM, Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div style="font-family:arial,helvetica,sans-serif">It was only a matter of time. HomeGrid is denying warranty on a BMS that I did not install. I can't prove when it was purchased or installed, but the original installer never registered it or connected it to the Internet. It was likely installed just over a year ago, perhaps 18 months. There was no Internet on site at the initial time of installation. What a garbage warranty policy.</div><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif">In this case, the BMS seems to be working behind the scenes. The battery modules are charging and discharging (confirmed with EMS Tools). The problem is that the LCD display shows all zeroes, and the unit will not work in parallel with the three other stacks. It is causing a parallel error and shutting down the whole house.</div><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif">I did exhaustive diagnostics on it with HomeGrid support, and they sent me a "CANalyst-II" tool to try to unbrick or update the faulty unit. All attempts to recover the unit failed, but I can "see" the whole stack of battery modules through the BMS's RS232 port. </div><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif">So they're going to further alienate a customer over a clearly faulty BMS unit that should be replaced under warranty. Not smart.</div><br clear="all"></div><div><br></div><div><div style="font-family:arial,helvetica,sans-serif">I will reiterate my recommendation against this brand for off-grid use. It's simply not resilient enough and too hard to service/maintain.</div><br></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">Principal Solar Designer | Florida Solar Design Group</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">NABCEP Certified Solar Professional (PVIP)</span><br style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:13px">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><img width="0" height="0" alt="" style="display: flex;" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 11, 2025 at 9:17 PM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">For what it's worth, they haven't said anything about internet connectivity on these two systems I'm dealing with right now, and they are both Gen 3.<div dir="auto"><br></div><div dir="auto">One site has a bunch of firmware discrepancies, and this is the site with one module that has all cells low voltage. Not sure if it's even recoverable. It's sitting at 39V.</div><div dir="auto"><br></div><div dir="auto">The other site has all the same firmware. This is the one I went to today. One of 16 modules (2 full stacks) has one of 15 cells internally that is low voltage. To me, that's a clear warranty swap situation, but customer service wasn't having it. Disassemble the battery and charge it? That's not a solution. It has been escalated. We will see what happens. </div><div dir="auto"><br></div><div dir="auto">Clearly we should be able to take these back to the shop for diagnostics at a minimum and get them RMA'd. Requiring the purchase of a Windows laptop and a battery charger is not ideal for sure. </div><div dir="auto"><br></div><div dir="auto">The only good thing I can say is customer service took over my PC today remotely and ran diagnostics after installing the required software (which isn't a fast process). I was expecting them to say, "yep it's toast and we're sending you a new one, valued customer."</div><div dir="auto"><br></div><div dir="auto">No such luck. </div><div dir="auto"><br></div><div dir="auto">Jason</div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 11, 2025, 6:48 PM Tyrone Houck via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div>Yep. And the 10 year warranty is only good if connected to the internet. Firmware update of every module is crucial or else there will likely be imbalances. You may be able to address it as 1 and shut of the others and charge it through the bus but if it's cell voltage is too low it may be an rma situation. I have had similar issues especially with gen 2. Zero issues yet with any gen 3 modules but the internet thing really struck a nerve as they only just recently got their internet monitoring functional.. having to go back to every site is a serious pain just to ensure what should be a basic warranty. Best of luck and feel free to contact me offsite if you have any other questions I might be able to help with.</div><div dir="auto">Tyrone Houck</div><div dir="auto">Oregon Solarworks LLC </div><div dir="auto">CCB #204937 LRT #076</div><div dir="auto">541-787-1366 </div><div dir="auto"><a href="mailto:tyrone@oregonsolarworks.com" rel="noreferrer" target="_blank">tyrone@oregonsolarworks.com</a></div><div><br> </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 11, 2025, 3:36 PM Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Hi Wrenches,<div dir="auto"><br></div><div dir="auto">I am regretting some HomeGrid Stack'd off-grid installations right now. There is a major flaw in the way these function in an error state. For those of you that don't know, these 48V batteries are stacked with a single BMS on top, covering up to 8 batteries below. Each battery module has a circuit breaker and dip switches to identify the battery communication number and location in the stack. Each BMS can be paralleled to additional stacks with communication cabling. </div><div dir="auto"><br></div><div dir="auto">The issue is when one battery module goes into an error state. What will happen is that battery stack's BMS will recognize the error, and then shut down the whole stack. This cascades to the other stacks and the system shuts down - fails to deliver 48V at the output terminals on the BMS of any stack.</div><div dir="auto"><br></div><div dir="auto">That is annoying, but what's even more problematic is you can't just shut off the offending battery to bypass it. You need to physically change all of the dip switches to bypass it and then reprogram the BMS to re-recognize the new module count (after taking it out of parallel). This is all very time consuming and requires the inverter system to be shut down. Even if a battery is not in an error state, you can't just turn it off. The whole system goes haywire. </div><div dir="auto"> </div><div dir="auto">Once you have it bypassed, you can hook up a RS-232 cable (Mac users need not apply) and use their software to gather diagnostics. Customer service will then want to do additional diagnostics with the battery in the stock, but that is not reasonable in and off-grid system where uptime is critical. One of the faulty modules I am dealing with was diagnosed as one of 15 cells with low voltage. The "solution" is to take it out of the stack and charge it to 100% with an external charger. </div><div dir="auto"><br></div><div dir="auto">By the time I'm done with all of the diagnostic nonsense, I can almost pay for a new battery with the lost labor. Isn't the whole idea for this not to happen with balancing done automatically? It was suggested to me that it didn't get charged to 100% often enough, and that is why it happened. That isn't an acceptable reason for failure in an off-grid system. </div><div dir="auto"><br></div><div dir="auto">I hate to say this, but EG4 has a far better 5kWh solution in this respect. Each module has it's own BMS. When one fails, you can simply turn off the circuit breaker and everything else continues to work. In fact, a fault in one BMS doesn't take out the whole stack or stacks of battery modules. </div><div dir="auto"><br></div><div dir="auto">Back to HomeGrid. When this happens, in my mind this is an automatic RMA. They should be replacing these, no questions asked. Especially at almost twice the price of EG4. They actually want me to disassemble the case of the battery and charge it with an external charger (which I don't have) directly from the terminals that are internal to the battery case. Totally unacceptable. Whatever is inside that case is their problem in my opinion. </div><div dir="auto"><br></div><div dir="auto">I am not selling anymore HomeGrid until I get satisfactory resolution to these issues. EG4 isn't perfect, but I have actually had pretty good success installing some that I sold and quite a few that consumers purchased directly. And at almost half the price, it's easier to eat the cost of a battery here and there for customer satisfaction.</div><div dir="auto"><br></div><div dir="auto">Anyone have similar issues with HomeGrid?</div><div dir="auto"><br></div><div dir="auto">Jason Szumlanski </div><div dir="auto">Florida Solar Design Group</div></div>
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